private void WriteXtsHeader(AesXtsFileHeader header, string filePath, string keyPath)
{
Debug.Assert(PathTools.IsNormalized(filePath.AsSpan()));
Debug.Assert(PathTools.IsNormalized(keyPath.AsSpan()));
header.EncryptHeader(keyPath, KekSource, ValidationKey);
using (IFile file = BaseFileSystem.OpenFile(filePath, OpenMode.ReadWrite))
{
file.Write(header.ToBytes(false), 0, WriteOption.Flush);
}
}
/// <summary>
/// Creates a new <see cref="AesXtsFile"/> using the provided key.
/// </summary>
/// <param name="path">The full path of the file to create.</param>
/// <param name="size">The initial size of the created file.</param>
/// <param name="options">Flags to control how the file is created.
/// Should usually be <see cref="CreateFileOptions.None"/></param>
/// <param name="key">The 256-bit key containing a 128-bit data key followed by a 128-bit tweak key.</param>
public void CreateFile(string path, long size, CreateFileOptions options, byte[] key)
{
long containerSize = AesXtsFile.HeaderLength + Util.AlignUp(size, 0x10);
BaseFileSystem.CreateFile(path, containerSize, options);
var header = new AesXtsFileHeader(key, size, path, KekSource, ValidationKey);
using (IFile baseFile = BaseFileSystem.OpenFile(path, OpenMode.Write))
{
baseFile.Write(header.ToBytes(false), 0);
}
}